Ammonites were shelled cephalopods that died out about 66 million years ago. Fossils of them are found all around the world, sometimes in very large concentrations. The often tightly wound shells of ...

From 200-million-year-old wave ripples on beach sand to a petrified tree stump, dinosaur footprints, and a giant ammonite, the past is imprinted on all of these gallery specimens. Explore fossils from ...

Fossils found in the northern part of Hokkaido are a new type of ammonite, the once-ubiquitous spiral-shelled creatures that went extinct with the dinosaurs 65 million years ago, researchers said.